Quantum Nuclear Magnets and Superfluid 4He in Nanopores

纳米孔中的量子核磁体和超流体 4He

• 批准号: 9802050
• 负责人: Yasumasa Takano
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802050&HistoricalAwards=false
• 关键词: Quantum; Nuclear; Magnets; Superfluid; 4He

9802050 Takano This project investigates quantum nuclear magnets at positive and negative spin temperatures. The studies will be performed primarily at sub-microKelvin spin temperature using the powerful nuclear demagnetization cryostats in the MicroKelvin Laboratory of the University of Florida, one of only two such facilities in the United States. The research will investigate the spin I=1/2 nuclei in yttrium and deuterium hydrides and their alloys. Their magnetic properties will be studied using ac susceptibility techniques and near-zero-field nuclear magnetic resonance employing superconducting quantum interference devices. These nuclear magnets promise to be the first realizations on the laboratory of a quantum dipolar magnet and random dipolar quantum magnets. The studies will address fundamental issues in magnetism involving fluctuations of highly quantum mechanical spins. A significant aspect of the project is to advance the education of postdoctoral associates, graduate students, and undergraduate students involved in experiments at a unique national facility. %%% This project investigates quantum nuclear magnets at positive and negative spin temperatures. The studies will be performed primarily at sub-microKelvin spin temperature using the powerful nuclear demagnetization cryostats in the MicroKelvin Laboratory of the University of Florida, one of only two such facilities in the United States. The research will investigate the spin I=1/2 nuclei in yttrium and deuterium hydrides and their alloys. Their magnetic properties will be studied using ac susceptibility techniques and near-zero-field nuclear magnetic resonance employing superconducting quantum interference devices. These nuclear magnets promise to be the first realizations on the laboratory of a quantum dipolar magnet and random dipolar quantum magnets. The studies will address fundamental issues in magnetism involving fluctuations of highly quantum mechanical spins. A significant aspe ct of the project is to advance the education of postdoctoral associates, graduate students, and undergraduate students involved in experiments at a unique national facility. ***

9802050高野这个项目研究正负自旋温度下的量子核磁体。这些研究将主要在亚微开尔文自旋温度下进行，使用佛罗里达大学微开尔文实验室的强大核退磁低温恒温器，这是美国仅有的两个此类设施之一。这项研究将研究氢化物和氢化物及其合金中的自旋i=1/2核。将使用交流磁化率技术和使用超导量子干涉装置的近零场核磁共振来研究它们的磁性。这些核磁体有望在实验室中首次实现量子偶极磁体和随机偶极量子磁体。这些研究将解决涉及高度量子力学自旋涨落的磁学基本问题。该项目的一个重要方面是推进在一个独特的国家设施中参与实验的博士后助理、研究生和本科生的教育。这个项目研究正负自旋温度下的量子核磁体。这些研究将主要在亚微开尔文自旋温度下进行，使用佛罗里达大学微开尔文实验室的强大核退磁低温恒温器，这是美国仅有的两个此类设施之一。这项研究将研究氢化物和氢化物及其合金中的自旋i=1/2核。将使用交流磁化率技术和使用超导量子干涉装置的近零场核磁共振来研究它们的磁性。这些核磁体有望在实验室中首次实现量子偶极磁体和随机偶极量子磁体。这些研究将解决涉及高度量子力学自旋涨落的磁学基本问题。该项目的一个重要方面是促进在一个独特的国家设施中参与实验的博士后助理、研究生和本科生的教育。***